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Callens – founded by Willy Callens in West Flanders (Belgium) in 1966 – is the market leader in industrial heating and air technologies. Since 2003, it has been managed by the second generation: Annick Callens and Windy Moerman. The family rooted company supports industrial firms in their transition to a low-emission future while their systems remain competitive, efficient and reliable. Today, Callens has grown into an international group of companies: the Callens Group. It consists of four complementary businesses: Callens (Belgium), Optimum (worldwide), Jonker (Netherlands) and Cometi (France), and offers advanced expertise in engineering, construction and service via 13 strategic branches. The group completes more than 100 turnkey projects worldwide a year.

Callens Questions

The Callens annual revenue was $12.6 million in 2026.

Windy Moerman is the CEO of Callens.

144 people are employed at Callens.

Top Callens Employees

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